Peak HP cam question

kenikh · 03-29-2006, 10:01 AM

Does anyone know what peak HP increases, based upon percentages, one can expect when using the Mod-S (DC40) cams over stock 'S' cams in the same motor? Something simple like linear interpolation would be OK. I'm just looking for a ball park estimate.

jluetjen · jluetjen's Garage

It will depend on the CR, engine size, porting, fuel system as well as the cam timing. In general I would expect the peak HP to be about the same and at about the same engine speed. But the GE40's should make for a more flexible engine since I believe that they have less overlap. But these are based on looking at the specs. Camgrinder should be able to answer more definitively.

Can you provide some more information about your engine?

kenikh · 11:30 AM

I recall Camgrinder saying peak HP is somewhat higher as well, which is why I asked. My engine is a 2.0S, stock everything; I should have been more explicit in terms of stating the engine breathing would support this cam. I would also assume the cam timing would be to spec on both.

My reasoning is this: I am having the MFI reintalled and as result the heads have to come off (currently wrong heads and cams - no MFI accomodations). Since I have to replace the cams anyway, I am wondering what to expect from DC40s in terms of peak performance.

jpnovak · 03-29-2006, 01:42 PM

The modeling I have done moves the peak HP up about 200 rpm. Most of this is due to the extra torque that is still made at the higher rpms. There is a very noticable increase in torque in the low rpm range. As they say its all about area under the curve. I like what I see. Seems like the best cam for those who want more power but don't want to spend the money to make an engine live at really high rpms, IMHO, greater than 7500.

btw, These are all based on a DesktopDyno program I got off the net. I have found that it produces a torque/HP curve shape that is very similar to the actual output but the particular numbers are not that close. YMMV.

camgrinder · 03-30-2006, 08:58 AM

I agree with both John and Jamie. This cam usually has a little better HP and a lot more torque. The powerband in the MFI 2.0 will come on in the low 4000's and pull to 7500. Most people claim it makes the car much easier to drive.

CBRacerX · CBRacerX's Garage

These are great cams, I used them in a short stroke 3.2 and the torque band was very wide. Great for slow-in, fast out corners

Highly recommended!

kenikh · 03-31-2006, 11:31 AM

After talking to Camgrinder and getting some additonal feedback, I am sold on the DC40s. Thanks to everyone! Now just to sell my current cams and we're on!